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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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VIPER35 датащи(PDF) 37 Page - STMicroelectronics |
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VIPER35 датащи(HTML) 37 Page - STMicroelectronics |
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37 / 44 page  DocID026980 Rev 4 37/44 VIPer35 Operation description 44 Figure 43. Brown -out: external setting and timing diagram VINon must be less than the peak voltage at minimum mains and VINoff voltage has to be less than the minimum voltage on the input bulk capacitor at minimum mains and maximum load. BR pin is a high impedance input connected to high value resistors, thus it is ready to pick up noise, which might alter the VINoff threshold when the converter operates or causes the undesired switch-off of the device during ESD tests. The pin ca be bypassed to ground with a small film capacitor (1-10 nF) to prevent any malfunctioning. If the brown-out function is not used, BR pin has to be connected to GND, ensuring that the voltage is lower than the minimum VDIS threshold (50 mV, see Table 7). In order to enable the brown-out function, BR pin voltage has to be higher than the maximum VDIS threshold (150 mV, see Table 7). |
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